Part Number: TRF371109
I am using TRF371109 in my new design, I want to just use SPI to control the PGA gain, then how do I deal with the parallel external control pins(Gain_B0 ，Gain_B1，Gain_B2 )?
Can these three pins be left NC(No connect) if no use?
The parallel external control pin can be optional to the SPI control. This is described in the GAIN CONTROL section on page 35 of the datasheet.
Please set register 1, bit 27 ENFASTGAIN to 0 so external control pins are ignored.
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In reply to Kang Hsia:
Thanks, I prefer to remove the all of external resistors. :)
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